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Converting small petrol engine to run on propane


Woodworks
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13 hours ago, openspaceman said:

 

 

The thing is that a cylinder of propane weighs a lot more than a tank of the same calories of petrol.

No problem with fuel density when working from home but might switch back to petrol when doing contract work

13 hours ago, openspaceman said:

 

Also back then the only economic size to buy was 47kg ( or a liquid draw off tank to fuel a hot air balloon, thius being the cheapest propane I'm told). Otherwise you can fill a portable tank at an autogas pump for just under 70p/litre. Thereby lies a problem, a litre of lpg only contains 70% of the calories of petrol whereas a kilo of lpg contains more calories than a kilo of petrol.

 

Once you draw off more than a few kW of power the propane freezes in the tank, this is why propane converted cars have a liquid draw off which is then vapourised by the coolant. So a 13hp air cooled engine may draw a bit much, I wonder if an exhaust heated vaporiser exists.

The Gear GB kits instruction do recommend the larger tanks to avoid over cooling but should be fine with the 47kg tanks apparently. Also its the cheapest bottled way to buy it.

13 hours ago, openspaceman said:

 

There are advantages in that the oil will stay golden, I ran a V8 LR 110  for nealy two  decades on LPG and only changed the oil at 20k mile intervals and it was still gold. A chap on a forum I belonged to sent his oil to be analysed and it was in spec at 25k miles but the detergent level had dropped and it was a bit more acid.

Good to hear

13 hours ago, openspaceman said:

 

 

 

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Was @gobbypunk not looking for a generator?

I can get some pictures of it next week. I guess it could equally be easily converted back to petrol if that interested anyone. It was used mounted inside a van on a mobile catering outfit that was one of my good ladies business.
I’m currently doing the most important piece of Arb work in the annual calendar - skiing in France. [emoji106]
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9 minutes ago, Woodworks said:

Price!

 

I get through 16-17 litres on a busy day so that would be around £70. From what I can work out gas is going to cost around £16 a day

They charge 70quid for 47kg near me which works out at £19/day on gas if you currently use 16 litres of petrol.

 

Autogas near me is 60p/litre  the equivalent price is £1.2/kg so 47kg of autogas would cost £56.40 even with road duty.

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12 minutes ago, openspaceman said:

They charge 70quid for 47kg near me which works out at £19/day on gas if you currently use 16 litres of petrol.

 

 

I can get the gas for £68 delivered and from what I can find out that should be 92 litres of propane. What economy figures do you think I should get with propane in comparison with petrol? I was working on the fuel economy being 20-25% less on propane

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